exam Maths Puzzle Numerical Ability

A circle in the standard (x,y) coordinate plane is tangent to they-axis at 9. What is the equation of the circle in standard form?

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exam Other Question

Hi heres one more..

For each rational function, identify any holes or horizontal or vertical asymptotes of its graph.
y = 3/(x-1) -2

thanks I think this problem has to do with graphs, its a string problem.
A string is stretched from corner to corner on a floor tiled with square tiles. If the floor is 28 tiles long and 35 tiles wide, over how many tiles does the string cover?